# Setting Julia version for JupyterLab

**URL:** <https://discourse.julialang.org/t/setting-julia-version-for-jupyterlab/40901>\
**Category:** General Usage\
**Tags:** question\
**Created:** [June 7, 2020, 1:06am UTC](https://discourse.julialang.org/t/setting-julia-version-for-jupyterlab/40901 "2020-06-07T01:06:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pauljurczak](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pauljurczak/32/921_2.png) [@pauljurczak](https://discourse.julialang.org/u/pauljurczak)\
**Post date:** [June 7, 2020, 1:06am UTC](https://discourse.julialang.org/t/setting-julia-version-for-jupyterlab/40901/1 "2020-06-07T01:06:21Z")

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I have 2 versions of Julia installed, but only one is visible in JupyterLab. How do I make both of them visible or select the visible one?

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**Author:** ![ericphanson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ericphanson/32/215186_2.png) [@ericphanson](https://discourse.julialang.org/u/ericphanson)\
**Post date:** [June 7, 2020, 1:10am UTC](https://discourse.julialang.org/t/setting-julia-version-for-jupyterlab/40901/2 "2020-06-07T01:10:34Z")

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I think the following should work:

In the Julia version that doesn’t show up, run

```julia
using Pkg
Pkg.add("IJulia")
Pkg.build("IJulia")

```

and then it should show up. You don’t have to add it if it’s already installed; it’s the build step that adds the kernel to jupyter.

I think you need to do this manually sometimes because Pkg thinks it only needs to `build` once per IJulia version (not per Julia install), but IJulia wants to be built per Julia install to be able to add the kernel.

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**Author:** ![pauljurczak](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pauljurczak/32/921_2.png) [@pauljurczak](https://discourse.julialang.org/u/pauljurczak)\
**Post date:** [June 7, 2020, 1:47am UTC](https://discourse.julialang.org/t/setting-julia-version-for-jupyterlab/40901/3 "2020-06-07T01:47:35Z")

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Thank you. `] build IJulia` solved the problem. I had it already installed, but didn’t know about the build step.